how to use cleanup method in MapReduce on reducer?

Question

Hello~ I've started to study Hadoop MapReduce.

When I use cleanup method in reduce, I get a error.

The method cleanup(Reducer.Context) of type exReduce must override or implement a supertype method.

I want to use cleanup method in reducer. but It's not easy to me.

What sholud I do..?

here is my example code.

public static class exReduce extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable>{
        private ArrayList<ArrayList<Integer>> totalArr = new ArrayList<ArrayList<Integer>>();
        private OutputCollector<Text, IntWritable> outputCollector = null;

        @Override
        public void configure(JobConf job){
        }

        @Override
        public void reduce(Text cell, Iterator<IntWritable> measures, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException{
            if(outputCollector == null) outputCollector = output;

            ArrayList<Integer> arr = new ArrayList<Integer>();
            StringTokenizer token = new StringTokenizer(cell.toString());
            while(token.hasMoreTokens()){
                arr.add(Integer.parseInt(token.nextToken()));
            }
            totalArr.add(arr);
        }

        @Override
        protected void cleanup(Context context){
            ArrayList<ArrayList<String>> cl_data = totalArr;
            System.out.println("cl_data_size: "+cl_data.size());
            System.out.println("cl_data: ");
            for(int i = 0 ; i < cl_data.size(); i++){
                for(int j = 0; j < cl_data.get(0).size(); j++){
                    System.out.println(cl_data.get(i).get(j)+" ");
                }
                System.out.println();
            }
        }
}

I want to use this line.

extends MapReduceBase implements Reducer

not use

extends Reducer.

Is there a method to solve it ??